Ready, Steady, Robo Slot by Playtech

Match a robot head directly above a body of the exact same colour and the pair locks together into a Full Robot. Do that and the robot fires one of three actions at random. It might drop up to two battery Wilds across reels 2, 3 and 4, scatter up to two extra Prize symbols onto the grid, or just hand over a straight credit prize worth 3x, 4x, 5x, 8x or 10x your bet. Up to three Full Robots can build and fire on a single spin, so a well-stacked board sets off all three actions at once.

Prize symbols run their own little economy. Each one shows either a cash value, anything from 1x up to 12x, or a STAR, and a STAR only reveals what it's worth once it lands in a win, paying 20x, 50x, 100x or the top 500x. Land five or more Prize symbols together and the Prize Pay Feature kicks in: every value on those symbols pays out, and the symbols themselves stick to the reels for two more spins, giving the claw arms time to assemble fresh Full Robots around them.

The Wild is a glowing battery canister that stands in for everything except the gear Scatter and the Prize symbols. It never shows up on reel 1, and it can't be counted as part of a Full Robot, so it works purely as a connector for ordinary ways wins. All of it plays out on a bright pastel robot assembly line, pale blue-and-cream machinery with pipes running behind the reels and articulated claws reaching in from both sides to stack the parts. Heads come in bold colours, a red one with glowing eyes, a blue one in orange goggles, a purple heart-shaped bot, and the bodies are chunky green pyramids, blue balls and red crates.

The golden gear Scatter only ever appears in the four corner positions. Three corners award 5 free games, four corners award 8, and the reels stretch to a taller layout that pushes the ways-to-win count well past the base game. Full Robots and the Prize Pay Feature both keep running through the round. It's a tidy, cheerful package rather than a high-drama one, and honestly a lot hangs on the robots picking the credit prize over another handful of low-value symbols, but when a clutch of Prize symbols and a 500x STAR line up together the factory earns its keep.